Subdomains, what are they?!
A subdomain can be seen as an extension to your main domain name. Lets put your domain name as
www.wooljumpers.com a subdomain for this is like so:
www.subdomain.wooljumpers.com now you may wonder what is the point of subdomains.
Well they run in the theme of better readability and SEO, so you can have your blog for your site at
www.blog.wooljumpers.com and any potential URLs will be
blog.wooljumpers.com/making-our-jumpers rather than
clients.wooljumpers.com can be your client portal.
contact.wooljumpers.com can be for contact information.